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Quantum reference frames for gravity

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  • UserCaslav Brukner, University of Vienna
  • ClockThursday 11 May 2023, 14:15-15:15
  • HouseZoom.

If you have a question about this talk, please contact Damian Pitalua-Garcia.

We have no experimental knowledge about whether spacetime and gravity exhibit quantum phenomena or not. In this talk, I propose an “extended symmetry principle” that states that dynamical laws are invariant when changing quantum reference frames. This principle alone implies that spacetime can be placed in a quantum superposition. We study two concrete situations: a clock near a gravitational source that is in spatial superposition, and a superposition of conformally related spacetime metrics inhabited by a massive quantised Klein-Gordon field. We construct the explicit quantum frame changes and, invoking the extended symmetry principle, show how to transform to a quantum frame in which the standard theories of general relativity and quantum field theory allow the dynamics to be determined.

This talk is part of the CQIF Seminar series.

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